/* === S Y N F I G ========================================================= */
/*! \file halftone.cpp
** \brief blehh
**
** $Id$
**
** \legal
** Copyright (c) 2002-2005 Robert B. Quattlebaum Jr., Adrian Bentley
** Copyright (c) 2008 Chris Moore
**
** This package is free software; you can redistribute it and/or
** modify it under the terms of the GNU General Public License as
** published by the Free Software Foundation; either version 2 of
** the License, or (at your option) any later version.
**
** This package is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
** General Public License for more details.
** \endlegal
*/
/* ========================================================================= */
/* === H E A D E R S ======================================================= */
#ifdef USING_PCH
# include "pch.h"
#else
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include "halftone.h"
#endif
/* === M A C R O S ========================================================= */
using namespace synfig;
using namespace std;
using namespace etl;
/* === G L O B A L S ======================================================= */
/* === P R O C E D U R E S ================================================= */
#define SQRT2 (1.414213562f)
/* === M E T H O D S ======================================================= */
float
Halftone::operator()(const Point &point, const float& luma, float supersample)const
{
float halftone(mask(point));
if(supersample>=0.5f)
supersample=0.4999999999f;
halftone=(halftone-0.5f)*(1.0f-supersample*2.0f)+0.5f;
const float diff(halftone-luma);
if(supersample)
{
const float amount(diff/(supersample*2.0f)+0.5f);
if(amount<=0.0f+0.01f)
return 1.0f;
else if(amount>=1.0f-0.01f)
return 0.0f;
else
return 1.0f-amount;
}
else
{
if(diff>=0)
return 0.0f;
else
return 1.0f;
}
return 0.0f;
}
float
Halftone::mask(synfig::Point point)const
{
int type=param_type.get(int());
Point origin=param_origin.get(Point());
Vector size=param_size.get(Vector());
Angle angle=param_angle.get(Angle());
float radius1;
float radius2;
point-=origin;
{
const float a(Angle::sin(-angle).get()), b(Angle::cos(-angle).get());
const float u(point[0]),v(point[1]);
point[0]=b*u-a*v;
point[1]=a*u+b*v;
}
if(type==TYPE_STRIPE)
{
Point pnt(fmod(point[0],size[0]),fmod(point[1],size[1]));
while(pnt[0]<0)pnt[0]+=abs(size[0]);
while(pnt[1]<0)pnt[1]+=abs(size[1]);
float x(pnt[1]/size[1]);
if(x>0.5)x=1.0-x;
x*=2;
return x;
}
{
Point pnt(fmod(point[0],size[0]),fmod(point[1],size[1]));
while(pnt[0]<0)pnt[0]+=abs(size[0]);
while(pnt[1]<0)pnt[1]+=abs(size[1]);
pnt-=Vector(size[0]*0.5,size[1]*0.5);
pnt*=2.0;
pnt[0]/=size[0];
pnt[1]/=size[1];
radius1=pnt.mag()/SQRT2;
radius1*=radius1;
}
if(type==TYPE_DARKONLIGHT || type== TYPE_LIGHTONDARK)
return radius1;
{
Point pnt(fmod(point[0]+size[0]*0.5,size[0]),fmod(point[1]+size[0]*0.5,size[1]));
while(pnt[0]<0)pnt[0]+=abs(size[0]);
while(pnt[1]<0)pnt[1]+=abs(size[1]);
pnt-=Vector(size[0]*0.5,size[1]*0.5);
pnt*=2.0;
pnt[0]/=size[0];
pnt[1]/=size[1];
radius2=pnt.mag()/SQRT2;
radius2*=radius2;
}
if(type==TYPE_DIAMOND)
{
//return (radius1+(1.0f-radius2))*0.5;
float x((radius1+(1.0f-radius2))*0.5);
//float x(((radius2-radius1)*((radius1+(1.0f-radius2))*0.5)+radius1)*2.0f);
x-=0.5;
x*=2.0;
if(x<0)x=-sqrt(-x);else x=sqrt(x);
x*=1.01f;
x/=2.0;
x+=0.5;
return x;
}
if(type==TYPE_SYMMETRIC)
{
float x(((radius2-radius1)*((radius1+(1.0f-radius2))*0.5)+radius1)*2.0f);
x-=0.5;
x*=2.0;
if(x<0)x=-sqrt(-x);else x=sqrt(x);
x*=1.01f;
x/=2.0;
x+=0.5;
return x;
}
return 0;
}